fletcher



' A. c. FLETCHER.

Grate-Bars.

No.152,736. Parentedluly 7,1874

FIG. 2.

dir

UNITED STATES PATENT. OEEIcE.

ADDISON O. FLETCHER, OF NEW YORK, N. Y.

IMPROVEMENT IN GRATE-BARS- Specification forming part of Letters PatentNo. 152,736, dated July 7, 1874; application filed December 27, 1873.

To all whom it may concern Be it known that I, ADDISON C. FLETCHER, ofNew York, in the county of New York and State of New York, have inventedcertain new and useful Improvements in Grate-Bars, of which thefollowing is a specification z This invention relates to grate-bars,which are provided with detachable fuel bearings or points 5 and itconsists in securing the fuelbearings toV the grate-bars proper by meansof a fastening device which is entirely separate or independent from thegrate-bar and point, so as to enable the latter to be firmly retained inposition, while not preventing the ready attachment or detachment of thepoint, to replace it with a new one when burned or worn out, thefastening medium being either in the shape of a screw-rivet orscrew-bolt, or other device made separate or distinct from the grate-baror point.

In the accompanying drawings, Figures l and 2 represent views fromopposite sides of a grate-bar constructed according to my invention.Fig. 3 is a plan or top view of the same. Fig. 4 is a transverse sectionthrough one of the detachable 4fuel bearings or points, showing the useof a screw for securing the latter. Fig. 5 is a correspondingview,representing a rivet-fastenin g device.

The letter A designates the body of a gratebar, which may be formed of asingle flat plate, preterablyot' wrought-iron, or it may be constructedof two or more plates riveted together, to give the requisite thickness.The fuel bea-rin gs or points B, which are arranged at the upper edge ofthe bar, are located at regular intervals apart, and may be cast, orotherwise formed, with a pendent iiange or extension-plate, D, at oneside, and with a short ear or lip, E, at the opposite side. Afuel-bearing point so constructed embraces the top edge of the body ofthe grate-bar, and is secured in position by means of a fasteningdevice, which is made entirelyT separate or independent from either thebar or point, so as to enable the fuel-bearings to be readily applied inposition in respect to the bar, and to be quickly detached therefromwhen worn and burned out, in Order to be replaced by a new point.

In order to carry out my invention I employ either a set-screw, solidrivet, screw-bolt, tubular rivet, or other suitable independentfastaperture in the flange D bein then dispensed with. In certaininstances I propose to employ a tubular rivet, which is inserted throughthe grate-bar body and ange of the fuel-bearing point, and then clinchedor riveted.

The method of fastening detachable fuelbearings to grate-bars, asabove-described,

is greatly superior in many respects to the plan heretofore practiced,in which the fastening device forms a part of the fuel-bearing and gratebar, for it will be perceived that a simple rivet or screw can bereadily applied, and serves also to secure a more permanent fastening,as it will prevent the fuel-point from moving in any directionwhatsoever, forming in fact a fastening which will hold the point in arigid position, without liability of displacement. The fuel bea-rings orpoints may be made of cast-iron, and the end ones, as also the centralones, be provided with side projections H, to retain the bars at theirproper distances apart, and also to prevent their bciugdis- 'placed bythe action of the heat.

I-Iaviug thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is

The combination of a grate-bar with detachable fuel bearings or points,and independent fastening devices F, 'or securing` the fuel-bearings tothe grate-bar to permit of their ready attachment and removal,substantially as and for the purpose set forth.

In testimony that` I claim the foregoing, I have hereunto set my handthis 23d day of December, 1873.

ADDISON O. FLETCHER.

llVitnesscs JAMEs L. Nonnrs, A. HILT Nonms.

